High Resolution Shallow Structure of Ebao Basin Revealed With DAS Ambient Noise Tomography and Its Relation to Earthquake Ground Motion

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Song Wang, Zhenghong Song, Xiangfang Zeng, Benxin Chi, Jun Xie, Feng Bao
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Abstract

The Ebao Basin, which locates along the northwest segment of the Qilian-Haiyuan fault, has experienced several destructive earthquakes in past decades. A 10 km long distributed acoustic sensing (DAS) array was deployed with an existing telecom fiber-optic cable after the 2022 Mw6.6 Menyuan earthquake, which destroyed high-speed railways and highways in this region. The DAS array continuously recorded ambient noise and earthquake signals during the 5-day deployment period. Noise cross-correlation functions (NCFs) were calculated, and the Rayleigh wave signal clearly emerged on the NCFs. The phase velocities of the fundamental mode between 2.5 and 17 Hz were measured with the modified Frequency-Bessel transform method. The S-wave velocity structure along the cable, extending to a depth of 200 m, was constructed using the surface wave tomography method. It consists of three blocks, with velocity variations of up to 12%. P-wave delay times of regional earthquakes support the lateral variation among the three blocks. Both Vs30 and site amplification predicted with our S-wave velocity model correlate well with the ground motion induced by local earthquakes. Precursor and coda waves on the NCFs reveal four possible faults, and fault zone scattered waves are also observed on the record of local earthquakes.

DAS环境噪声层析成像揭示鄂宝盆地高分辨率浅层构造及其与地震地震动的关系
鄂宝盆地位于祁连-海原断裂西北段,近几十年来经历了多次破坏性地震。在2022年门源Mw6.6级地震摧毁了该地区的高速铁路和公路后,在现有的电信光缆上部署了一个10公里长的分布式声传感(DAS)阵列。在5天的部署期间,DAS阵列连续记录环境噪声和地震信号。计算噪声互相关函数(nfc),在nfc上清晰地出现瑞利波信号。用改进的频率-贝塞尔变换方法测量了2.5 ~ 17 Hz基模的相速度。利用面波层析成像方法构建了沿电缆延伸至200 m深度的s波速度结构。它由三个区块组成,速度变化高达12%。区域地震的纵波延迟时间支持三个地块之间的横向变化。用我们的横波速度模型预测的Vs30和场地放大都与局部地震引起的地面运动有很好的相关性。nfc上的前导波和尾波揭示了4条可能的断层,在局部地震记录上也观察到断裂带散射波。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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